<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .sliderbar {
        position: fixed;
        right: 0;
        bottom: 100px;
        width: 40px;
        height: 40px;
        text-align: center;
        line-height: 40px;
        cursor: pointer;
        color: #fff;
    }
    
    .con {
        position: absolute;
        left: 0;
        top: 0;
        width: 200px;
        height: 40px;
        background-color: purple;
        /* text-align: center; */
        z-index: -1;
    }
</style>
<script src="JavaScript/animate.js"></script>

<body>
    <div class="sliderbar">
        <span>⬅</span>
        <div class="con">问题反馈</div>
    </div>
    <script>
        var sliderbar = document.querySelector('.sliderbar');
        var con = document.querySelector('.con');
        sliderbar.addEventListener('mouseenter', function() {
            animate(con, -160, function() {
                sliderbar.children[0].innerHTML = '➡';
            });
        });
        sliderbar.addEventListener('mouseleave', function() {
            animate(con, 0, function() {
                sliderbar.children[0].innerHTML = '⬅';
            });
        });
    </script>
</body>

</html>